Portion of a pillow



FIG. 1 is a perspective view of a portion of a pillow showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a right side elevational view thereof; and,

FIG. 7 is a left side elevational view thereof.

The straight, parallel broken lines adjacent to the shaded portions of the pillow represent the boundaries of the claimed design. The broken line boundaries form no part of the claimed design. 

The ornamental design for a portion of a pillow, as shown and described. 